Linux Rescue Mode Help

[Dave Martini 1]

I commented out the /etc/fstab file entry for / and 
want to know how to fix this.
I tried to boot from CD #1 in rescue mode but the file system
is read only and won't let me edit the /etc/fstab file.

I also tried booting in emergency mode and S mode and 
since / is commented out in /etc/fstab it doesn't show up.

Is there anyway I can fix this?

Thank You.
David Martini
LLNL